Olive Oil (Extra Virgin)

Gundry endorses extra-virgin olive oil without reservation as the primary fat source. He treats it as the key carrier for polyphenols (chiefly oleocanthal, hydroxytyrosol) that dampen inflammation and support endothelial function. He is strict about quality — cold-pressed, dark bottle, recent harvest.

Li ranks EVOO among top foods across multiple defence systems. Oleocanthal is anti-angiogenic in vitro against tumour vasculature (relevant to angiogenesis balance), polyphenols protect DNA from oxidative stress, and the monounsaturates support membrane regeneration.

The evidence is unusually strong for a food and spans several longevity axes. Cardiovascular: PREDIMED is one of the few nutrition RCTs to show a hard endpoint reduction for a specific food (~30 % fewer cardiovascular events); the Guasch-Ferré cohort found lower all-cause and disease-specific mortality with higher EVOO intake. Mechanism: the polyphenols protect LDL cholesterol from oxidation — an effect solid enough that the EFSA grants it an official health claim (from ~5 mg hydroxytyrosol and derivatives per day, about 20 g of good EVOO). Oleocanthal inhibits COX enzymes much like low-dose ibuprofen, giving an anti-inflammatory action. Add better endothelial function, more favourable HDL function and signals for cognitive protection within the Mediterranean pattern. Two honest caveats: first, the benefit is tied to genuine, polyphenol-rich extra virgin oil — refined or old, rancid oil doesn't have it, and the market is heavily affected by blending and fraud (check harvest/best-before date, dark bottle, protected origin). Second, at 884 kcal/100 g olive oil is energy-dense — ideally it replaces worse fats rather than adding to them.

PubMed studies: ~2,400